Indicating calipeb



Aug. 27, 1929. F. L. cHAPERLo ET A1. 1,725,898

INDICATING CALIPER Filed Aug. 15, 1927 l Il Patented Aug. 27, 1929.

UNITED STATES PATENT OFFICE.

FRANK L. CHAPERLO AND JOSEPH W. ZENGERLE, OF CLEVELAND, GEIQ.

INDICATIN Gr CALIPER.

Application filed August 15, 1927. Serial No. 212,878.

rlhis invention is an improved construction of indicatorl caliper, theobject being te provide a simple and highly eliicient device which canbe applied to the material to be measured While said material is inmotion.

Another object of the invention is to provide a tool which can be usedto indicate measurements in inches and measurements in the metricsystem.

Another object of the invention is to provide a tool in which it Willonly be necessary 'to apply the same to the article to be. measured andthe measurement in inches or millimeters Will be indicated upon a dial.,the movement of one Aof the parts serving to operate a pointer or handfor indicating upon the dial the measurement in external diameter of thearticle measured.

l/Vth these various objects in View7 the invention consists in the novelfeatures of construction and in the manner of constructing and arrangingthe same, all of which will be fully described hereinafter and set forthin the appended claims.

In the drawings forming part of this speelication, Fig. 1 is a sideelevation of the device partly in section; Fig. 2 is a top plan view ofthe same and Fig. 3 is an enlarged sectional vievv of the pointeroperating mechanism.

In the practical embodiment of our invention7 we employ a yoke shapedhandle portion 10 having a tubular portion 11 at one end in which ismounted the manually adjusted spindle 12 While at the other end of thehandle shaped yoke is the tubular portion 13 in Which Works theadjustable spindle 14 which actuates the indicating pointer. Themanually operated spindle 12 may be round or square in cross sectionbeing provided With a keyvvay 15 to prevent turning. One face of thisspindle 12 is provided With serrations 16 which are graduated accordingto the fractions of an inch While upon the other side there are providedserrations 17 Which are graduated according to the metric system. Thetubular portion 11 is provided With a vertical extension 18 in WhichWorks the pin 19 the inner end of which engages the serrated face of thespindle and holds the spindle against longitudinal movement. This pin isoperated by means of the trigger 2O normally held depressed by means ofthe spring 21 secured to Said trigger by rivets 21a.

The spindle 12 is removable longitudinally for the purpose of reversingthe same from the side graduated in inches to that graduated accordingto the metric system and vice versa.

The adjustable spindle 14 is movable in the tubular housing 13 and isprovided with a collar 22 against which bears a coil spring 23 containedwithin the tubular housing and tensioned by means of screw plug 24screwed into the end of the tubular housing, said screw plug beingapertured for the reduced end 14 of the adjustable spindle to Workthrough.

The adjustable spindle is formed with. a tapered portion 25 with whichcontacts the end of a plunger 26, said plunger having rack teeth 26a cuttherein and adapted to engage a toothed pinion 27 Which is secured toand operates the curved arm 28 provided With a toothed are 29 which inturn meshes with a pinion 3() secured on the shaft 301 on which is fixedthe indicating pointer or hand 31. The pinion 27 and pinion 30 arecarried by a frame 32 arranged Within a substantially cylindrical shapedcasing 33 connected to one side of the tubular housing 13 and throughwhich the plunger 26 Works. The casing` 33 may be made integral With orattached to the tubular housing as preferred.

The casing is provided with a dial 34- having graduations 35 and 367 onebeing in inches and thc other according to the metric system and thisdial is rotatable in the casing 33 so as to bring either set ofgraduations next to the tubular housing 13 and in position forindicating With the hand or pointer 31 the measurement of the articlebeing measured. The casing 33 is provided with the usual. dial seat onWhich the dial 34 is free to be rotated about the pin 30a.

In operation the spindle 12 is adjusted at any desired point with theproper graduated side uppermost and the dial 34 will be fixed tocorrespond with the scale of graduations on the spindle 12. The deviceas a Whole is then placed on the article to be measured and inasmuch asthe post or spindle 12 is fixed the adjustable spindle will be moved andthis movement of the adjust able spindle 14 Will on account of thetapered portion 25 thereof operate the plunger 26 which in turn meshingwith the toothed pinion 27 will cause the arm 28 to move rotating thepinion 29 and moving the pointer or hand 31 a distance indicating theexternal diameter of the article being measured.

When the device is removed from the article being measured, the spring23 Will return the adjustable spindle to its normal position and thecoil spring 37 surrounding the reduced end of the post 26 Will causethis post to resume its normal position, bringing back the pointer 31and the arm 28 to their normal position.

It Will thus be seen that by means of a device constructed as hereinshown and described the external diameter of the artic-le can bemeasured while said article is being rotated as it is only necessary totorce the device down upon said article and read the measurement uponthe dial thereby avoiding the necessity of stopping the machine for thepurpose ofy calipering the article being turned.

Having thus described our invention, what We claim is:

l. In a device of the kind described, a yoke having a tubular'housing ateach end thereof, a graduated spindle xed in one housing and capable ofadjustment With reference thereto, a spring actuated spindle movable inthe other housing, a casing connected to said housing which carries thespring actuated spindle, said casing having a dial and pointer, themovable spindle having a tapered portion, a spring actuated plungercontacting' with said tapered portion and means operated by said plungeri'or moving said pointer.

2. ln a device of the kind described, a yoke having atubular housing ateach end thereof, a graduated spindle fixed in one housing, andadjustable with reference thereto, a spring actuated locking pin forholding said spindle in its adjusted position, a spring actuated spindlearranged in the other housing` and having a tapered portion, a casingconnected to the said housing` which carries the spring actuated spindleand provided With a graduated dial and a pointer, a spring actuatedplunger arranged in said casing and contacting with said tapered portionof the spindle and means contained Within said casing whereby themovement of the plunger is communicated to the indicating pointer.

In testimony whereof, we hereunto alix our signature.

FRANK L. CHAPERLG. JOSEPH W. ZENGERLE.

